The effect of the addition of Al 2 O 3 and the heat treatment mode on the luminescence spectra of gallate glass ceramics has been investigated. The possibility of increasing the efficiency of its luminescence by
changing the submicron inhomogeneous structure of the initial glasses is shown.
Nanoporous glass is a universal matrix in which, by impregnating various substances, it is possible to initiate the appearance of properties uncharacteristic of glass. In this case, the porosity of glass can be controlled by heat treatment, creating a material with a given structure and properties. In this work, we studied the effect of heat treatment on the structure of porous glass impregnated with gold, and revealed the potential of this material as active substrates for Raman spectroscopy.
The effect of Nd 2 O 3 (0.1 - 3.0 & # 37;, molar content) oxide additives on the synthesis conditions, crystallization and spectral properties of heat-resistant sitall of the Li system was studied 2 O & ndash; Al 2 O 3 & ndash; SiO 2 (LAS). Introducing it to 1 & # 37; molar content of Nd 2 O 3 does not affect the crystallization properties and precipitation of the main crystalline phase of & # 946; -eucryptite-like solid solutions Li x Al x Si l & ndash; x O 2 , while an increase in the molar content of Nd 2 O 3 to 3 & # 37; significantly changes the character of crystallization of LAS glass. The results obtained show that an optical sitall with a near-zero LTEC value, activated by neodymium ions up to the N N d 3 + & # 8776; 4 & middot; 10 2 0 cm & ndash; 3 , can be considered as a basis for creating new light-emitting thermostable optical media
Reliable protection of the screens of new generation mobile devices requires the use of transparent materials that are stronger than glass. In this work, the influence of sitallization conditions on the structure and properties of sitall based on the ZnO - MgO - Al 2 O 3 - SiO 2 system is studied and is shown the prospects of its application for these purposes. Optimization of the sitallization mode allows increasing the microhardness of the material to values ??of more than 900 HV while maintaining transparency
The prospects of using recycled carbon fiber extracted from aviation carbon fiber waste for reinforcing composite materials based on blast-furnace slag activated with sodium silicate solution are evaluated. The influence of the concentration and length of the secondary carbon fiber on the structure, physical and mechanical properties and the nature of the destruction of dispersed-reinforced composites has been investigated.
The possibility of obtaining lightweight porous proppants based on metallurgical slags has been investigated. The structure, phase composition and some operational and physical properties of the obtained spheroidized bodies have been studied.
The possibilities of strong local bonding of glasses and metals with close thermal expansion coefficients by means of welding with a femtosecond laser beam have been investigated. For the first time, measurements of the shear strength of a welded joint of quartz glass with an Invar alloy, which amounted to about 26 MPa
Powders of composition La 1 & ndash; x Sr (Ca) x CoO 3 (x = 0.2) was obtained using the sol-gel method. To dry the gels, a microwave installation (radiation power 90 W, frequency 2450 MHz) and a drying oven (temperature 180 ° C) were used. Using the methods of thermogravimetry and differential scanning calorimetry, X-ray phase analysis, transmission electron microscopy, the properties, phase composition and morphology of particles of the obtained powders of complex composition were investigated.
The processes of femtosecond laser recording of luminescent microregions in silicate glass with a mass content from 0.5 to 4.0 & # 37; cadmium sulfide. The regularities of the change in the optical properties of microregions on the composition of the glass and the acting dose of laser radiation have been established.
The object of research is ceramic foam materials based on aluminum oxide, magnesium oxide and aluminum-magnesia spinel. The results of research on sintering spinel ceramics using aluminum and magnesium oxides as initial components are presented. It is shown that the optimal range of firing temperatures for obtaining materials with an open-cell pore structure is 1600 - 1700 ° C. Materials with communicating porosity up to 85 & # 37; and compressive strength up to 1.4 MPa
